feat: Added UI advanced options '-referer' header functionality

[mrdastt]

Here are the key modifications made in this commit:

• A new field for "Referer" has been added to the HTTP settings section.
• The code has been updated to include the "Referer" field in the user interface, allowing users to input a value for the referer when configuring HTTP settings.
• Appropriate changes have been made to ensure that the "Referer" field is included when generating input options for a network request.

I noticed this functionality was unavailable and resorted to manually adding in the -referer field in db.json which resulted in a few issues after restarted, after investigation I saw others dealing with the same issue so I decided to modify it. Currently working as intended!

Form change reference:

[ioppermann]

Thanks a lot for this PR. I made a small change: the label of the form field uses the correct spelling of Referrer. The

I merged it into the dev branch.